This is not true. To say it is a stop sign could not be more wrong. The statement “one essence, three persons” is one of the foundational statements of orthodox Christianity and expresses incredibly deep and profound truths about the living God. To say that "historically it has been acknowledged that it was limited in what it tells us" is simply incorrect. The Reformers held dearly to the ecumenical creeds precisely because they are the foundation of the faith.
Calvin following Augustine affirmed that we say Person because we have to say something. That language is all we have. Of course it is a stop sign. It is saying, Don't go beyond this point. Augustine: "Yet, when the question is asked, What three? human language labors altogether under great poverty of speech. The answer, however, is given, three persons, not that it might be [completely] spoken, but that it might not be left [wholly] unspoken."
Again, "Why, therefore, do we not call these three together one person, as one essence and one God, but say three persons, while we do not say three Gods or three essences; unless it be because we wish some one word to serve for that meaning whereby the Trinity is understood,
that we might not be altogether silent, when asked, what three, while we confessed that they are three?"
We are certainly not starting with the Three and finishing with the One. To quote Gregory of Nazianzus
Perichoresis is mutual indwelling of Three Persons. Of course it is starting with the Three.
This is the way that the Church Fathers thought of the Trinity. This debunks the claim that the phrase "one essence, three persons" is a phrase that is limited in what it tells us.
Your reference expresses the mystery that the tradition struggles with: "I cannot grasp the greatness of that one so as to attribute a greater greatness to the rest. When I contemplate the three together, I see but one torch, and cannot divide or measure out the undivided light." This is the kind of problem the orthodox are working with and part of the great tradition within which Van Til was working.
This was not an open question at the time of the Reformation, it had already been explained by the fact that each person is coequal and coeternal. God is one being and three persons and there never was a time when this was not the case. There is no room to think that this constitutes four somethings, unless one is not familiar with the historic debates and statements of the Church (I do not have you in view when I make this statement).
Within the historic debates there are not "four somethings" because they all stop at the mystery. Augustine discusses the problem of genus and species within the context of the 2nd quotation provided above. The purpose of the language is to avoid a fourth something, a "substance" which is somehow more than the Persons.
If this is what VT was trying to show then it would be quite shocking, as this would be an ahistorical understanding of theology.
The history is what it is.
I couldn't disagree with you more. The problem is the formula "one person, three persons". This formula has further implications which tend towards a heretical view of God, such as when Van Til tries to explain that Christ is "coterminous with the Father". This is a statement that leads to an erosion of the distinctions between the persons, further undermining the orthodox teaching of the last 1500 years.
This would put it back in the line of heresy. It is as if nothing has been accomplished by this thread. That is a shame.